*{
    margin: 0;
    padding: 0;
}

a{
    color: #fff;
    text-decoration: none;
    transition: 0.3s;
}
a:hover{
    opacity: 0.7;
}

.logo{
    font-size: 24px;
    text-transform: uppercase;
    letter-spacing: 4px;
}

nav{
    display: flex;
    justify-content: space-around;
    align-items: center;
    font-family: "system-ui",-apple-system, 'Helvetica',Arial, sans-serif;
    background: #23232e;
    height: 8vh;
}

main {
    background: url("./bg.jpg") no-repeat center center;
    background-size: cover;
    height: 92vh;
}

.nav-list{
    /* 黑点消失 */
    list-style: none;
    display: flex;
}

.nav-list li{
    letter-spacing: 3px;
    margin-left: 32px;
}

.mobile-menu{
    display: none;
    cursor: pointer;
}

.mobile-menu div{
    width: 32px;
    height: 2px;
    background: #fff;
    margin: 8px;
    transition: 0.3s;
}

/* 开始响应式 */
@media(max-width:999px){
    body{
        overflow-x: hidden;
    }
    .nav-list{
        position: absolute;
        top: 8vh;
        right: 0;
        width: 30vw;
        height:92vh;
        background: #23232e;
        flex-direction: column;
        align-items: center;
        justify-content: space-around;
        transform: translateX(100%);
        transition: transform 0.3s ease-in;
    }

    .nav-list li{
        margin-left: 0;
        opacity: 0;
    }

    .mobile-menu{
        display: block;
    }

    .nav-list.active{
        transform: translateX(0);
    }

    @keyframes navLinkFade {
        from{
            opacity: 0;
            transform: translateX(50px);
        }
        to{
            opacity: 1;
            transform: translateX(0);
        }
    }
}


.mobile-menu.active .line1{
    transform:  rotate(-45deg) translate(-8px ,8px);
}
.mobile-menu.active .line2{
   opacity: 0;
}
.mobile-menu.active .line3{
    transform:  rotate(45deg) translate(-5px ,-7px);
}